A car travels a certain distance along a straight road (in the +x direction). Th

Question

A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. When the car changes speed it does so uniformly. Fill in TRUE, FALSE, GREATER THAN, LESS THAN, or EQUAL TO for each statement.

1. The x-acceleration is ..... zero at 79 sec .
2. The acceleration magnitude at 15 sec is ..... the acceleration magnitude at 38 sec.
3. The speed at 4 sec is ..... the speed at 67 sec.
4. The x-acceleration is ..... zero at 15 sec.
5. At 48 sec, the speed is as high as it gets.
6. The speed is ..... zero at 26 sec.

Using the graph above, calculate the average speed of the car for the period from 0 to 80.0 s

Explanation / Answer

1.True

2.Equal

3.greater than

4.True

5.true

6.True

7.1200/80 =15 m/s

Average speed = total distance/total time.

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